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Concentrating solar power, which has been around for decades, is one of the most promising techniques being tried today to make solar electricity more cost effective.

In four years, U.S. gas prices have doubled to more than $3.70 a gallon, and crude oil has tripled to around $125 a barrel. Allowing for inflation, that's higher than prices were during the 1978-83 oil shock that triggered a recession and sky-high interest rates. But . . .

have a biking nemesis: During my regular rides around the six-mile outer loop of New York's Central Park, the big hill at the north (uptown) end of the park invariably sucks the very life out of my aging legs. Yesterday, however, pedaling up the big incline was another story altogether. It was as easy as climbing a small rise. My new-found prowess had nothing to do with any improved fitness, of course; it was the bike I was riding, the Twist Freedom DX from Taiwan's Giant Bicycle, Inc., which augments every pedal stroke with a finely timed electric boost.

The world's oceans are an energetic place, and military-industrial giant Lockheed Martin said today it has been granted $1.2 million by the Department of Energy to demonstrate that ocean thermal energy conversion is possible. Although the ocean often doesn't feel very warm, the temperature gradient between the warm, sun-soaked surface and the frigid, dark depths provides enough of a differential to run a heat engine. The idea has been kicking around for over a century but has never been scaled. Lockheed Martin helped build the largest ocean thermal energy conversion system to date back in the 80s, but it only ever produced 50,000 watts, or .05 megawatts.

While much attention on renewables in recent years has focussed on solar and wind technologies, awareness has been growing around the enormous energy generating potential of the Earth's oceans. A 2005 report from the Electric Power Research Institute stated that wave power properly and effectively harnessed, would likely have minimal environmental impact, and be much less visible on the landscape, than competing technologies. At the same time, waves possess the advantage of being more predictable than either wind or solar, which in principle makes ocean power a more reliable source of energy.

The Guardian has a report on some new tidal power technology from a company in Wales inspired by ship propellers and wind turbines - Tidal power gets a boost from propeller and wind turbine techonology. Propellers on ships have been tried and tested for centuries in the rough and unforgiving environment of the sea: now this long-proven technology will be used in reverse to harness clean energy from the UK's powerful tides. The tides that surge around the UK's coasts could provide up to a quarter of the nation's electricity, without any carbon emissions. But life in the stormy seas is harsh and existing equipment - long-bladed underwater wind turbines - is prone to failure.A Welsh renewable energy company has teamed up with ship propulsion experts to design a new marine turbine which they believe is far more robust.

Harnessing the energy of the sunlight that you purposefully block from your eyes while out on a bright and cheery day. Sounds very waste not, want not, right? Well, a group of designers came up with just the solution you may want for this notion, and it just might be the best looking solar powered accessory we've seen so far. The glasses are called SIG, or "Self-Energy Converting Sunglasses" and they can power your iPod or PSP while you're out walking around. The lenses are made of dye solar cells, and your iPod can plug into the jack at the bottom of the frame.

Earlier today I received an email from the office of Pittsburgh city councilman Bill Peduto announcing an ambitious plan that will reduce Pittsburgh's carbon footprint while saving the city millions in electricity costs. Peduto, who has been the only city legislator to propose green legislation of any sort over the last few years, wants the city to convert all 40,000 of its street lamps to energy efficient LED lighting. The cost of the program will be around $24 million and will be paid using a combination of the annual costs savings and funding from the state's Guaranteed Energy Savings Agreement. Pittsburgh would join cities such as Austin, Raleigh (home LED manufacturer CREE), and Toronto as major cities who have adopted LED lighting on a large scale. According to Peduto, Pittsburgh would be the largest city in the US to roll out a complete conversion to LED lighting. This would be great news for Pittsburgh's green agenda, especially in light of today's Pittsburgh Penguin's press conference, where they announced the 21 year naming rights deal for their new arena, which will be known as the Clean Coal Center.

Finally all the scientific advances have led us to change around and old and fairly useless substance. In face as children we would buy the special fish that would eat it off of the sides of our fish tanks.

Doing a few chores around the house this month can save homeowners major expense in the spring, according to Rick Felton, President of Homeservice Club of Canada. "By doing a little preventative maintenance now, you can prevent minor problems from escalating into a major headache in the spring," Felton said. "Minor repairs done now can prevent air and moisture penetration from attacking the structural integrity of your home down the road," he added.

Clean energy company Econcern will partner with China National Offshore Oil Corp and Sinohydro to invest 863 million euros ($1.09 billion) to build four Chinese wind farms, the companies said on Tuesday. Construction of the wind farms, which will generate around 720 megawatts (MW) of renewable energy, will begin in 2009, Netherlands-based Econcern said in a statement.

Coal plants are abundant in the United States. According to the Department of Energy they produce around 49% of the energy that we use.

REW has an article on making the switch to a clean energy world - Will the Children of Today Be Living in a World Powered by Renewable Energy by 2050?. The world needs a one-off switch-over to renewable energy -- and this could be largely accomplished in just forty years time, slashing energy costs and greenhouse gases while allowing healthy economic growth, experts say. By 2050, 80 percent of the world's electricity could be coming from renewable energy sources provided efforts are made, in parallel, to improve energy efficiency, according to a study by the German Aerospace Center (DLR). That means, the children of today might well grow up to experience a world where the energy they use comes almost entirely from the sun, wind, sea and biomass. By 2090, the shift to renewable energy around the world could be almost 99 percent completed reducing pressure on the environment and laying the foundations for a new era of prosperity based on green energy.

The use of water to harness energy has been around for thousands of years but it is only in the modern times that it has been employed to generate electrical energy, which is called hydropower.

Just in case you missed it, green careers are coming quick. Every time you turn around you get a new list of top green careers.

A green career can be an opportunity to take off in a business that should be around for the next career wave.

"The world's largest tidal power station will be constructed off the coast of Incheon. GS Engineering and Construction signed a memorandum of understanding with state-run Korea Hydro and Nuclear Power (KHNP) on Wednesday and will begin construction later next year with a view to completion around 2017. The power station will have a capacity of 1.32 million kw/h, surpassing the 1 million kw/h of a nuclear reactor being constructed in Ulsan and 3.4 times greater than the capacity of the Rance Tidal Power Station in France, currently the world's largest. It will generate 2.41 billion kw per year, the equivalent of 60 percent of Incheon's household electricity consumption."

As Earth Day reaches middle age - it turns 40 today - will it get all the respect it's grown to expect?From those who love it? Always. It's a chance for environmentalists, young and old, to look back on all that has been accomplished, but address the continuing challenges.

In the home, these Vampires represent between 5 and 8 percent of a single family home's total electricity use per year, according to the Department of Energy. The problem is multiplied many times over in offices in the US and around the world according to an international study released this week by 1E and the Alliance to Save Energy. The study found nearly half of US workers who use a PC at their job do not typically shut down at night. The 2009 PC Energy Report, which examines workplace PC power consumption in the US, UK and Germany, estimated that US organizations waste $2.8 billion a year to power 108 million unused machines. In 2009, these unused PCs are expected to emit approximately 20 million tons of carbon dioxide, roughly the equivalent impact of 4 million cars.

Vice President Joe Biden and Energy Secretary Steven Chu today announced plans to invest $3.2 billion in energy efficiency and conservation projects in U.S. cities, counties, states, territories, and Native American tribes. The Energy Efficiency and Conservation Block Grant program, funded by President Obama's American Recovery and Reinvestment Act, will provide formula grants for projects that reduce total energy use and fossil fuel emissions, and improve energy efficiency nationwide. "These investments will save taxpayer dollars and create jobs in communities around the country," said Vice President Biden. "Local leaders will have the flexibility in how they put these resources to work - but we will hold them accountable for making the investments quickly and wisely to spur the local economy and cut energy use."